Spauk plug



H. G. SCHLECHT..

SPARK PLUG.

APPLICATION FILED FEB. 14, 1920.

Patented Sept. 5,1922.

Schlech c vithe ss Fatented Sept. 5, 1922.

UNITED STATES PA'rENr ersten.,

HAROLD G. SGHLECHT, 03? BRADENTOWN, FLORIDA,

SPARK PLUG.

Application filed February 14, 1920.

?luge 'for inter'ial c nnhnstion engines and has 4 its ob ect theprovison o a soark pl n which weolectrode is vable with r ;poet to theother wnile remaining always at a constant ilistance there'troin andmovahle at every explosion within the cylinder, whereby the :tormaticnoi an oil bridge between 'the electrodes will be ynevented and whereby ashort circniting cause-:l by an aecn'mlation ol" carbon betv 'een theGlGCtHMlGS will also bo prevented.

An in'portajt and .more the pro-vision of a spari: plug this characteria: which is provided a niet-al disk slidably mounted upon the centralel rode and movnble within the hollow body oil 'he plug, the dish' enaging and closing the end of the slcirt of :a the porcelani insnlator atevery explosion in the cylinder.

An additional object is the provision oi? plug of this character whichwill be simple and incxpensive in nanntacture, highly eiiicient in use,durable and long lived in service and a general improvement in the art.

Nith the above and other objects and 'ad-- vantages in. view theinvention consists in the details oi constrijction to be hereinattormore :tull'y described and claimed and ilhistratel in the accompanyingdrawings in which Fignre l is a longitudinal sectional view through myimproved plug, and

Figure 2 is a cross sectional view therethrough.

licterring more particularly to the drawings, the letter A. designatesthe body ot the plig which :crned of metal and which of ordinaryConstruction and which has the lower end of its bore E oi" unitormdiameter. The letter G designates the porcelain insula'tor having theusual depending skirt D and through which extends the central electrodeE.

In carrying out my invention I provide a metal washer or disk 10 whichhas a central hole and which is slidably engaged upon the electrode E,the latter having its extremity upset or lifted, as shown at ll, Wherebyto object is Serial No. 358528.

provide retaining means to prevent the disk from slipping oti This diskhas a diameter one sixteenth oi' an. inch less than the internal.diameter ot the bore so that there will be provided a continuons sparkgap one thirty-second of an inch between the periphery ot the disk 10and the inner wall of the bore B, it being well known that one th :'t-second ot an Inch lS the most desii'able length spark gan.

in the operation ot my plug it will be seen 'that it will he inipossihle'tor a drop oi? oil to remain in bridging relation to the disk and plugas at every explosion in the cylnder the disk will he :forced along theelectrode E. During the compression. stroke in the cylinder there willbe no movement in the disk .as the pressire on both sides will be equalhot the explosion being sndden will cause movement of the disk. lt willbe seen that regardless of: the *position of the disk along electrode Ih the proper spark gap will always he provided; will also be appai cntthat it will be impossible for carbcn to accumulate within the bore ofthe plug or to get into the skirt of the porcelain insulator as thisskirt is closed by the disk at each explosion and as the disk slideswithin the bore continually,

lVhile I have shown and described the prcterred einbodiment of myinvention, it is oi" course to be nnderstood that I reserve the r ht tomake such changes in the form, (-onstrnction, and arangement oi parts aswill not depart From the spirit ot the invention or the scope ot thesubjoined claims.

:Living thus described my invention, I claim:

l. In a spark plug, a metallic shell a main electrode red having` itscylinder end surrounded by the corresponding end of the shell, and adisk slidahly Inounted on the cylinder end ot the rod and having itsedge located adjacent to the wall of the shell to produce a spark gapbetween said edge and wall.

2, In a spark plug, a metallic shell, a main electrode rod having itseylinder end surronnded by the coresponding end of the shell and a plateslidahly noun ted on the cylinder end of the rod and having its edgelocated adjacent the wall of the shell to produce a spark gap betweensaid edge and wall.

In testimony whereof I ahx my signature.

HAROLD G. SCHLE CHT.

